Why does fmt.Println inside a goroutine not print a line?

Question

I have the following code:

package main

import \"net\"
import \"fmt\"
import \"bufio\"

func main() {
    conn, _ := net.Dial(\"tcp\", \"irc.freenode.net:66         


        

Answer 1

Write data to a channel ch at the end of goroutine and read data from ch out of goroutine can make the main function waiting for goroutine print message.

Here is an example:

package main

import "net"
import "fmt"
import "bufio"

func main() {
conn, _ := net.Dial("tcp", "irc.freenode.net:6667")

reader := bufio.NewReader(conn)
ch := make(chan byte, 1)
go func() {
    str, err := reader.ReadString('\n')
    if err != nil {
        // handle it
        fmt.Println(err)
    }
    fmt.Println(str)
    ch <- 1
  }()
  <-ch
}